
.flex_ac{    
    display: flex;
    display: -webkit-flex;
    align-items: center;
    -webkit-align-items: center;
}
.flex_center{    
    display: flex;
    display: -webkit-flex;
    justify-content: center;
    -webkit-justify-content: center;
    align-items: center;
    -webkit-align-items: center;
}
.flex_justify_between{    
    display: flex;
    display: -webkit-flex;
    justify-content: space-between;
    -webkit-justify-content: space-between;
    align-items: center;
    -webkit-align-items: center;
}
.flex_1{
    flex:1;
    -webkit-flex:1;
    display: block;
}